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Due to worrisome reason, the 'Entrance to Hell' in Russia is sealedNear the Norwegian border somewhere in the depths of the Arctic Circle in Russia lies the deepest hole ever drilled, once called "the entrance to ... of the way through Earth's crust with ...
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World's deepest hole sealed up for concerning reasonThe Kola Superdeep Borehole is the deepest manmade hole, and deepest artificial point, on Earth, measuring at 40,230ft feet.
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